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From Wikipedia:

Recalcitrant seed

Recalcitrant seeds are seeds that do not survive drying and freezing during ex-situ conservation and vice versa. By and large, these seeds cannot resist the effects of drying or temperatures less than 10 °C; thus, they cannot be stored for long periods like orthodox seeds because they can lose their viability. Plants that produce recalcitrant seeds include avocado, mango, mangosteen, lychee, cocoa, rubber tree, some horticultural trees, aquatic plants, such as... Read More

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